WHAT is the RAPTURE exactly What, How, When & Why

"Rapture is the moment when the heart sings with joy, and the soul dances in the light of infinite possibility."
"Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed-in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed." - 1 Corinthians 15:51-52